Buggy code:
final class ServerControllerService implements Service < ServerController > { private static final Logger log = Logger . getLogger ( "org.jboss.as.server" ) ; private static final int DEFAULT_POOL_SIZE = 5 ; private final Configuration configuration ; private final InjectedValue < ServerDeploymentRepository > injectedDeploymentRepository = new InjectedValue < ServerDeploymentRepository > ( ) ; private final InjectedValue < ServiceModuleLoader > injectedModuleLoader = new InjectedValue < ServiceModuleLoader > ( ) ; private final InjectedValue < ExternalModuleService > injectedExternalModuleServie = new InjectedValue < ExternalModuleService > ( ) ; private ServerController serverController ; public ServerControllerService ( final Bootstrap . Configuration configuration ) { } public static void addService ( final ServiceTarget serviceTarget , final Bootstrap . Configuration configuration ) { } @ Override public synchronized void start ( final StartContext context ) throws StartException { final ServiceContainer container = context . getController ( ) . getServiceContainer ( ) ; final ServiceTarget serviceTarget = context . getChildTarget ( ) ; final Bootstrap . Configuration configuration = this . configuration ; final ServerEnvironment serverEnvironment = configuration . getServerEnvironment ( ) ; final ExtensibleConfigurationPersister persister = configuration . getConfigurationPersister ( ) ; final ThreadGroup threadGroup = new ThreadGroup ( "ServerController-threads" ) ; <START_BUG> ThreadFactory threadFactory = new JBossThreadFactory ( threadGroup , Boolean . FALSE , null , null , null , null , AccessController . getContext ( ) ) ; <END_BUG> final ExecutorService executorService = Executors . newScheduledThreadPool ( ServerControllerService . DEFAULT_POOL_SIZE , threadFactory ) ; final ServerControllerImpl serverController = new ServerControllerImpl ( container , serviceTarget , serverEnvironment , persister , injectedDeploymentRepository . getValue ( ) , executorService ) ; serverController . init ( ) ; final List < ModelNode > updates ; try { updates = persister . load ( ) ; } catch ( Exception e ) { throw new StartException ( e ) ; } ServerControllerService . log . info ( "Activating<seq2seq4repair_space>core<seq2seq4repair_space>services" ) ; final AtomicInteger count = new AtomicInteger ( 1 ) ; final ResultHandler resultHandler = new ResultHandler ( ) { @ Override public void handleResultFragment ( final String [ ] location , final ModelNode result ) { } @ Override public void handleResultComplete ( ) { if ( ( count . decrementAndGet ( ) ) == 0 ) { } } @ Override public void handleFailed ( final ModelNode failureDescription ) { ServerControllerService . log . errorf ( "Boot<seq2seq4repair_space>update<seq2seq4repair_space>failed:<seq2seq4repair_space>%s" , failureDescription ) ; if ( ( count . decrementAndGet ( ) ) == 0 ) { } } @ Override public void handleCancellation ( ) { if ( ( count . decrementAndGet ( ) ) == 0 ) { } } } ; for ( ModelNode update : updates ) { count . incrementAndGet ( ) ; update . get ( ROLLBACK_ON_RUNTIME_FAILURE ) . set ( false ) ; serverController . execute ( Factory . create ( update ) . build ( ) , resultHandler ) ; } if ( ( count . decrementAndGet ( ) ) == 0 ) { } final EnumMap < Phase , SortedSet < RegisteredProcessor > > deployers = serverController . finishBoot ( ) ; final File [ ] extDirs = serverEnvironment . getJavaExtDirs ( ) ; final File [ ] newExtDirs = Arrays . copyOf ( extDirs , ( ( extDirs . length ) + 1 ) ) ; newExtDirs [ extDirs . length ] = new File ( serverEnvironment . getServerBaseDir ( ) , "lib//ext" ) ; serviceTarget . addService ( JBOSS_DEPLOYMENT_EXTENSION_INDEX , new ExtensionIndexService ( newExtDirs ) ) . setInitialMode ( ON_DEMAND ) . install ( ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_SERVICE_MODULE_LOADER , new DeploymentUnitProcessor ( ) { @ Override public void deploy ( DeploymentPhaseContext phaseContext ) throws DeploymentUnitProcessingException { phaseContext . getDeploymentUnit ( ) . putAttachment ( SERVICE_MODULE_LOADER , injectedModuleLoader . getValue ( ) ) ; phaseContext . getDeploymentUnit ( ) . putAttachment ( EXTERNAL_MODULE_SERVICE , injectedExternalModuleServie . getValue ( ) ) ; } @ Override public void undeploy ( DeploymentUnit context ) { context . removeAttachment ( SERVICE_MODULE_LOADER ) ; } } ) ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_MOUNT , new DeploymentRootMountProcessor ( ) ) ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_MANIFEST , new ManifestAttachmentProcessor ( ) ) ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_ADDITIONAL_MANIFEST , new ManifestAttachmentProcessor ( ) ) ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_SUB_DEPLOYMENT , new SubDeploymentProcessor ( ) ) ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_MODULE_IDENTIFIERS , new ModuleIdentifierProcessor ( ) ) ) ; deployers . get ( STRUCTURE ) . add ( new RegisteredProcessor ( Phase . STRUCTURE_ANNOTATION_INDEX , new AnnotationIndexProcessor ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_STRUCTURE_DESCRIPTOR , new DeploymentStructureDescriptorParser ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_COMPOSITE_ANNOTATION_INDEX , new CompositeIndexProcessor ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_ADDITIONAL_MODULES , new AdditionalModuleProcessor ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_CLASS_PATH , new ManifestClassPathProcessor ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_EXTENSION_LIST , new ManifestExtensionListProcessor ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_EXTENSION_NAME , new ManifestExtensionNameProcessor ( ) ) ) ; deployers . get ( PARSE ) . add ( new RegisteredProcessor ( Phase . PARSE_SERVICE_LOADER_DEPLOYMENT , new ServiceLoaderProcessor ( ) ) ) ; deployers . get ( DEPENDENCIES ) . add ( new RegisteredProcessor ( Phase . DEPENDENCIES_MODULE , new ModuleDependencyProcessor ( ) ) ) ;

Fix:
final ThreadFactory threadFactory = new JBossThreadFactory ( threadGroup , Boolean . FALSE , null , "%G<seq2seq4repair_space>-<seq2seq4repair_space>%t" , null , null , AccessController . getContext ( ) ) ;